06 300 SRT8 TCM update - Chrysler 300C Forum: 300C & SRT8 Forums
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post #1 of 3 (permalink) Old 02-03-2013, 09:07 PM Thread Starter
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06 300 SRT8 TCM update

Is there an update for our TCM? I thought I read some where that Chrysler was reflashing these with an update but now I can't find it.

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post #2 of 3 (permalink) Old 02-04-2013, 08:01 AM
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There was a TCM flash to correct a 1 - 2 upshift problem issued in 2006 or 2007. Others may have been issued but that is the only one I had done.

All the TSB's are listed here:

Complete TSB list from 300c forum - Dodge Charger Forums

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2006 300C SRT8
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post #3 of 3 (permalink) Old 02-04-2013, 02:42 PM
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Looks there are 2 TSBs related to TCM Software:

21-020-06

SUBJECT:
Flash: SRT 8 - Delayed Or Rough 1-2 shift at Wide Open Throttle After Kickdown

OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Transmission Control Module (TCM) with new software.

MODELS:
2005 - 2006 (LX) 300 SRT 8/ Charger SRT 8/ Magnum SRT 8
2005 - 2006 (LE/LX) Chrysler SRT 8/ Chrysler Touring SRT 8
(International Markets)
2006 (WK) Grand Cherokee SRT8
2006 (WH) Grand Cherokee SRT8 (International Markets)

SYMPTOM/CONDITION:
The customer may experience a delayed 1-2 shift at wide open throttle after a kickdown. This is often referred to as a harsh or jerky shift which is the result of the engine reaching the maximum engine speed fuel cut off prior to the transmission shifting.

NOTE: This flash will also change the strategy for the “Autostick” feature. This version will allow the transmission to upshift when the maximum engine speed is reached. The previous version would not allow the upshift unless the driver selected the next gear. Once the flash is performed, all of the changes are permanent and cannot be reversed.

18-031-05

SUBJECT:
Flash: Shift Hesitation During Wide Open Throttle

OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Transmission Control Module (TCM) with new software.

MODELS:
2005 - 2006 (LX) Chrysler 300, Magnum, Charger SRT-8

NOTE: This bulletin applies to vehicles equipped with a 6.1L engine (sales code ESF) and a NAG1 automatic transmission (sales code DGJ) built on or before July 25, 2005.

DISCUSSION:
Randomly during a wide open throttle condition the engine RPM goes beyond the fuel cutoff point before the 1-2 upshift is made. This causes a short hard bump at the beginning of the shift. It is more likely to occur if the vehicle is traveling around 15 MPH and then the throttle is pushed to wide open (WOT).
This condition is caused by the TCM not being able to calculate the correct engine speed at which to initiate the shift.
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